Exhauster



(No Model.) 2 Sheets-Sheet 1.

NP. PRATT. EXHAUSTBR.

No. 602,770. PatemedApr.19,1898.

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(No Model.) 2 Sheets- Sheet 2. N. P. PRATT. BXHAUSTBR.

Patented Apr.v 19, 1898.

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UNTTED 'STATES PATENT Tricia.

NATHANIEL P. PRATT, OF ATLANTA, GEORGIA.

EXHAUSTER.

SPECIFICATION forming part ef Letters Patent No. .602,770, dated April 19, 1898. Appneetien nea retmry 1s, 1897. serai Ne. 623,313. (No model.)

To all whom t may concern.'

Be it known that I, NATHANIEL P. PRATT, a citizen of the United States, residing at Atlanta, in the county of Fulton and State of Georgia, have invented certain new and useful Improvements in Exhausters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to exhausters.

The objects are to provide an exhauster adapted particularly in use for handling corrosive gases, either acid or alkaline, in which those parts subjected to direct contact with the gases will be shielded from the corrosive action thereof; to provide an exhauster having a casing of such construction as to permit of easy and ready access to the interior thereof for the purpose of removing the blast-wheel without disturbing the permanent parts of the apparatus; to provide simple and eective means for holding the blast-wheel on the shaft and for shielding such means from the action of the gases, and, finally, to provide an exhauster which shall be simple in construction, durable and eiiicient in use, and which may be constructed at a nominal figure.

In an exhauster characterized by my invention I provide a blast-wheel casing, cast or made by hand, of an alloy of lead and antimony or other non-corrosive materials. This casing is constructed of two parts, one part of which may be designated as the stationary portion and the other part as the re-A movable portion. The stationary portion is provided with the usual entry and exit iiues, and these latter, for the purpose of preventing escape of gases at these points, may be burned to the stationary portion of the casing or maybe provided with Hanges to be bolted to similar flanges on the said stationary portion. The stationary portion is also provided with a suitable stanchion on one side opposite the entry-line which supports the boxes or bearings in which works the blastwheel shaft, the said shaft being provided with a non-corrosive protecting-sleeve to shield the shaft againstthe corrosive action of gases which may escape at this point and which would tend to destroy the exterior portion of the shaft. This stationary portion may be constructed of two sections, as usual, (though it may be made in one or any number of sections,) and be held together by bolts passing through ianges provided for the purpose, an acid-tight joint being provided by interposing a suitable'packing or cement between the flanges, or by burning these parts together, as willbe understood. The removable portion of the casing may occupy the upper part thereof to one side the entry or exit iue, or both, as may be preferred, and is secured to said lower portion by bolts passing through flanges provided for the purpose, suitable packing or cement being interposed between the lianges to present a tight joint, this removable portion, as also the stationary portion, being provided on one side with a section of a stuffing-box in which the sleevecovered shaft Works. The removable portion is of such size With relation to the stationary portion that upon its removal the :interior of the casing will be exposed to view, so that, if desired, the blast-wheel may be removed.

The blast-wheel is to be constructed of any suitable non-corrosive materials and should possess sufficient rigidity to present the requisite strength for speed without danger of losing its shape. This wheel may be secured to the shaft by which it is driven in any suitable manner, as by casting the wheel around a right and left hand threaded bushing, which may also be provided with keys, and securing this bushing to the shaft by a key or by so shaping the shaft and the bushing as to prevent the turning of the shaft therein, or the keys may be dispensed with and the bushing serve to hold the wheel in place, or the bushing may be simply roughened or have projecting points, which will sink into the metal of the wheel when the same is cast around it, or the shaft may be rounded and fixed in the bushing by an ordinary key, or the key may be dispensed with, and the shaft may be made square, triangular, hexagonal, or otherwise in cross-section, the bushing being shaped to fit the shaft, or the hub maybe soldered to the shaft.

The removable portion of the casing may IOO be constructed in one or more sections, preferably in one, and the flange or flanges by which it is secured to the stationary'portion may extend only to the entry or exit lues, or may extend over and join a similar flange on either one of these iiues or both.

In order to facilitate access to the blast- Wheel, the same is free from any support at one end, so that by removing the section of the casing just described the portion of the stuiiing-box attached will come apart with it and the shaft and its blast-wheel may be lifted Out.

ed works in bearings entirely removed and free from the casing, so that they will be readily accessible for the purpose of oiling or otherwise.

Further and more specificfdetails of construction will be hereinafter described. Y

In the accompanying drawings, forming a part of the specification, and in which like letters of reference indicate corresponding parts, I have illustrated a form of" embodiment of my invention, although it is to be understood that other forms of embodiment thereof may be employed without departing from the spirit of my invention.

In the drawings, Figure l is a view in side elevation, displaying the exhauster as it appears When set up for use, the View being taken from the pulley side of the casing. Fig. 2 is a view in plan. Fig. 3 is a View in end elevation. Fig. 4 is a view in elevation of the blast-wheel. Fig. 5 is a view in vertical section, showing more particularly the manner in'which the vblast-Wheel is secured to the shaft. Fig. 6- is a detached viewof the right and left hand threaded bushing for holding the Wheel in place on the shaft; .and Fig. 7 is a view in transverse section, showing more particularly the manner in which the sections of the casing are joined.

Referring tothe drawings, A designates the stationary portion of the casing, and A2 the removable portion thereof. The stationary portion is provided on one side-with an entrydue a and at its periphery with an exit-flue a2., as usual, it being understood that I do not limit myself to the precise location of these i'lues, as their position may be altered without departing from the spirit of my invention. The stationary portion of the exhauster is constructed of one or more sections, and if more than one are employed they are secured together by flanges a3, through which pass bolts a4 for holding the parts assembled, these flanges being packed, cemented, or burned together in any well-known manner to present a tight joint. In this form of my invention the stationary portion is shown provided with legs or standards a5 for supporting the casing; but it is to be understood that these legs may be dispensed with and the casing supported upon an ordinary base.

The shaft on which the blast-wheel is mount-l The removable portion A2 may be in one piece, or it may be made of more pieces and is provided with flanges a6 on its body and with side flanges a7, mating with similar flanges cts on the stationary portion of the casing, and through these latter flanges bolts are passed for holding the two parts assembled, any suitable packing, such as indestructible putty or the like, being placed between the flanges for the purpose of making a tight joint. It is to be understood that the location of the iianges a7 CLS may be changed and may be either straight or curved. The iianges a6 are also to be burned,packed,or cemented together to present a tight joint. The flanges ai a8 are to be so formed as to avoid 'interference with the entry-line on that side of thecasing, and on the opposite side of the casing these flanges are to be curved into the'shaft-openingasat 1.9, and to be provided each witha section of a stuffing-box for the shaft. The objects of curving or projecting the portion a9 of the casingk in toward the entry-flue are twofold. First, to have the bearing or stufting box as near the `blast-wheel as possible to reduce leverage and thus prevent wabbling and eccentric movement of the Wheel with attendant vibrations and'consequentinjurious rackthe casing is highly advantageous and increasesthe usefulness and life of the device.

As will be noted by reference to Fig.r3, the inner end of the blast-wheel drive-shaft, or that end next Vto theinlet-opening, Ais not supported, as it is essential that the Vinlet-line should be freefrom any obstruction,.and.this arrangement, due to Vthe Weight of the blastwheel, puts a great strain on this end of the drive-shaft, and without the novel means of supporting the same, as shown, the leverage would be so great that in a short time the wheelwould Wabble and have eccentric movement, and thereby tend rapidly to destroy the'bearings.

By the peculiarmanner of curving the sides of the casing inward around the shaftonthe pulley side to present two members of a studing-boxadmission of air from Without or escape of gas from within is obviated, and by having the journal-boxes as near the plane of rotation of thewheel as possible the wheel is supported, braced, and steadied,.so that under all conditions of use it will run in a true circle.

It will be apparent that by removing the bolts for holding the flanges a7 as together anddetaching the removable portion of the casing access to the interior thereof .may be had without interfering with the fixed parts IOS IIO

of the casing-that is to say, with the stationary portion thereof-and with the entry and exit flues.

The blast-wheel B is to be made of any suitable material combining strength with noncorrosive qualities, and may be of any preferred shape for the purpose. The hub l) of this wheel has in this instance fitted within it a bushing C,provided with right and left hand threads, this bushing being held in place within the hub by having the metal thereof cast around it. The shaft D of the blastwheel is provided at one end with a collar d, against which the bushing() and the outside projecting end of the hub abut, said shaft being in this instance held against turning by being united, as by keying into the bushing, the bushing being made really a part of the blast-wheel hub, or by lightly tinning the surface of the same before the blast-wheel is cast around it. A key cl2 may be inserted between the bushing and the shaft and similar keys c between the bushing and the hub to hold these two securely assembled; but, as before stated, the particular manner of holding the blast-wheel in place on the shaft may be varied at will. The outer end of the shaft is threaded, and on this threaded portion are turned two nuts C23 d4, the latter constituting a locking-nut, these nuts serving to force the hub tightly against the collar d and thereby further prevent the wheel from turning on the shaft. In order to protect the end of the shaft carrying the nuts cl3 d4 and also the nuts from the corrosive action of the gases, a cap b2 is burned onto the hub of the blast-wheel and ineloses these nuts. When the wheel is to be removed from the shaft, this cap may be cut off and the nuts and key removed in an obvious manner to eect release of the wheel.

The shaft D is supported exteriorly ofthe casing upon a bed E,having journal-boxes e, in which the shaft works, these boxes being provided with suitable openings e2, by which oil may be supplied to the shaft, the latter also being provided with a pulley e3, by which the Wheel may be driven.

In order to remove the liquids resulting from condensation of gases, a drip-pipe F is provided at the bottom of the casing, by which the liquid may be removed as rapidly as generated and caught in a suitable receptacle, as G.

It is to be understood that I do not limit my invention to the materials and to the particular use described, as the apparatus is adapted for handling gases other than those described or for air. In the latter instance the casing may be made of wood, paper, or other suitable materials instead of metal.

Having thus fully described myinvention, what I claim as new, and desire to secure `by Letters Patent of the United States, is-

1. An exhauster-casing comprising a stationary portion provided on one side with an entry-flue and at its periphery with an exitue, and a peripherally-removable portion extending to the axis of and impermeably secured to the stationary portion, the removable portion being of such size that,when removed, an opening is left, through which the blastwheel and its shaft can be taken out without detaching either of the flues, substantially as described.

2. An exhauster-casing comprising a stationary portion provided on one side with an entry-flue and at its periphery with an exitiiue, and a peripherally-removable portion extending to the axis of and impermeably secured to the stationary portion, a blast-wheel mounted in the stationary portion opposite the entry-flue, and a stufng-box arranged partly on the stationary portion and partly on the removable portion for preventing admission of air from Without or escape of gas from within, the removable portion of the casing being of such size that, when removed, an opening is left, through which the blastwheel and its shaft can be taken out without interference with either of the iues, substantially as described.

3. An exhauster comprising a stationary portion having an entry and an exit flue, and a removable portion, the sides of the two portions, opposite the entry-flue, being curved or bent inward to present two members of a stuffing-box, substantially as described.

4. "An exhauster comprising a stationary portion having an entry and an exit flue, and a removable portion, the sides of the two portions, -opposite the entry-flue, being curved or bent inward to present two members of a stuffing-box, a shaft running in the stuffingbox, and a blast-Wheel supported on the shaft v in juxtaposition to the stufling-box, substantially as described.

5. An exhauster comprising a stationary IOO portion having an entry and an exit flue impermeably secured thereto, and a removable portion, the removable portion being adapted to be separated from the stationary portion without interference with any of the parts of the latter, the sides of the two portions, opposite the entry-flue, being curved or bent inward to present two members of a stuflingbox, a blast-wheel mounted within the casin g and having a shaft running in the stuffingbox, theend of the shaft, opposite the entryue, being unsupported, substantially as described.

6. An exhauster-casing comprising a stationary portion provided on one side with an entry-flue and at its periphery with an exitiiue, and a peripherally-removable portion extending to the axis of and impermeably secured to the stationary portion, the removable portion being of such size that, when removed, an opening is left, through which the blast-wheel and its shaft can be taken out without interference with either of the flues, and a drip-pipe connected with the casing, substantially as described.

IIO

7. In an exhauster, a shaft, a blast-wheel wheel and to the shaft, and keys inserted be- 1o secured thereto by solder or the like, nuts setween the bushing and shaft, substantially as cured on one end of the shaft for holding the described. wheel in place, and a non-corrosive cap or In testimony whereof I affix my signature 5 casing inclosing the nuts and the end of the in presence of two witnesses.

shaft, substantially as described. NATHANIEL P. PRATT.

8. In an exhauster, the combination with a Witnesses:

shaft, of a blast-wheel, a right and left hand W. P. HEATH,

threaded bushing` secured to the'hub of the YV. B. LAINE. 

